Automated Execution Systems

The final piece of the settlement puzzle is understanding how trades are actually matched and executed. Modern markets rely heavily on electronic systems, but alternative venues handle significant volume as well.

Electronic Trading Systems

• NYSE uses automated execution for eligible orders (NYSE Rule 1000 Series)
• Orders are matched and executed electronically without floor broker intervention for most standard orders
• Provides speed and efficiency in trade processing
• The vast majority of orders today are executed electronically, even on traditional exchanges like the NYSE

Key benefit: Electronic execution reduces errors, increases speed, and provides an audit trail for every order.

Alternative Trading Systems (ATS) - Regulation ATS

An ATS is an electronic venue that matches buy and sell orders outside traditional exchanges.

• Must register with the SEC as a broker-dealer and file Form ATS
• Not classified as a national securities exchange (even though it performs a similar matching function)
• FINRA Rule 4551 requires ATSs to record and transmit order/execution information

Exam Tip: Gotchas

• ATSs register as BROKER-DEALERS, not as exchanges. They file Form ATS with the SEC.
• Even though ATSs match orders like exchanges, they do not have Self-Regulatory Organization (SRO) status.

Common Types of ATS

• Dark pools: ATSs that do not display orders publicly before execution; provide anonymity for large institutional orders
• Electronic Communication Networks (ECNs): ATSs that display orders and allow subscribers to trade directly with each other

Why Dark Pools Exist

• Large institutional orders can move the market if displayed publicly
• Dark pools allow institutions to trade large blocks without revealing their intentions
• After execution, trades are reported to the appropriate reporting system (e.g., Trade Reporting Facility (TRF) for equities)
• Dark pools reduce market impact but face criticism for reduced transparency

Exam Tip: Gotchas

• Dark pools provide anonymity but must still REPORT trades after execution (e.g., to the Trade Reporting Facility (TRF) for equities).
• ECNs display orders; dark pools do NOT. This distinction is frequently tested.

ATS vs. Exchange